ISL6144IVZA Intersil, ISL6144IVZA Datasheet - Page 17

• Manufacturer Part Number: ISL6144IVZA
• Description: IC CTRLR MOSFET ORING HV 16TSSOP
• Manufacturer: Intersil

Specifications of ISL6144IVZA

• Applications: Telecom/Datacom Systems
• Fet Type: N-Channel
• Number Of Outputs: 1
• Internal Switch(s): No
• Delay Time - On: 1ms
• Delay Time - Off: 250ns
• Voltage - Supply: 10 V ~ 75 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 16-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Supply: -

hold off and other internal bias and reference circuitry. The
charge pump circuitry starts functioning as the input voltage
at the V
depends on the load current (as explained in previous
sections), The maximum gate voltage will be clamped to a
maximum of V
be handled with 20mV across the source-drain terminals.
Overall, it takes less than 1ms to reach the load-dependent
final gate voltage value. Note that the Input voltage cannot
be hot swapped and has to rise slowly. A rise time of at least
1ms is recommended for the voltage at VIN pin.
V
V
V
HV
5V/DIV
0A
IN1
0A
IN1
IN
FIGURE 18. FIRST FEED V
REF(Vz)
= 48V; RESISTIVE LOAD = 4A, C
, V
,V
IN
G1
G1
20V/DIV
5A/DIV
,I
, I
pin reaches a value around 8V. The gate voltage
IN1
V
IN1
20V/DIV
I
OUT
IN1
and HV
GQP
V
and V
G1
WHEN V
3V to 4V, GATE CHARGE PUMP ACTION STARTS
WHEN V
AND HVREF REACHES 3V TO 4V
GATE CHARGE PUMP ACTION STARTS
2A/DIV
10V/DIV
when load current becomes too high to
OUT
REF(VZ)
I
IN1
V
IN
G1
WAVEFORMS
IN
REACHES ~ 8V AND HVREF REACHES
WAVEFORMS
REACHES ~ 8V
17
IN1
V
10V/DIV
GSEXT
START-UP (48V CASE)
IN1
= 33nF
V
20V/DIV
IN1
4A
4A
ISL6144
The start-up tests were done with the addition of an external
gate to source capacitor to demonstrate start-up time with a
total equivalent gate-source capacitance around 39nF.
SECOND (CONSECUTIVE) FEED START-UP
In this case, the ISL6144 for the second (consecutive) feed
(U4) already has output bias voltage as the first parallel feed
has been turned on and V
As V
respect to GND). When V
turned. Second feed gate turn-on is faster than the first feed as
the HVREF capacitor (C
consecutive power supply to be started can be turned on faster
than the first power supply, a rise time of at least 200µs of the
second rail is recommended.
FIGURE 20. SECOND (CONSECUTIVE) FEED V
RELATED DELAY
V
POWER SUPPLY
SECOND GATE TURNS ON ONLY
IN
IN2
FIGURE 19. FIRST FEED V
= 48V; RESISTIVE LOAD = 4A, C
rises, V
WHEN V
V
IN2
G2
IN
= 12V; RESISTIVE LOAD = 5A, C
REACHES V
rises with it (V
IN THIS CASE GATE VOLTAGE IS MEASURED
3
2A/DIV
) is already charged.The second or
IN2
OUT
5V/DIV
I
BETWEEN GATE2 AND GND
5A/DIV
IN2
V
IN1
approaches V
IN1
I
is present on the common bus.
IN1
IN1
G2
GS(EXT)
START-UP (12V CASE)
20V/DIV
is GATE2 voltage with
20V/DIV
V
V
V
5V/DIV
G2
IN2
= 33nF
OUT
IN1
20V/DIV
V
OUT
GSEXT
value, Gate 2 is
IN2
5V/DIV
V
January 6, 2011
START-UP
G1
= 33nF
FN9131.6